Rotary cutter.



No- 892,977. PATENTED JULY 1 4, 1908- J. B. UANTWELL. ROTARY CUTTER.

APPLICATION FILED MAY 7, 1907.

Marta saw (MAW ENE

screen corms.

n6. eeaew.

Specification of Letters Patent.

Patented July 14, 1908.

Application filed May 7, 1907. Serial No. 372,389.

T all whom it may concern:

Be it known that I, JOHN B. CANTWELL, a citizen of the United States of America, residing at Watertown, in the county of Jefferson and State of New York, have invented certain new and useful Im rovements in Rotar Cutters, of which the ollowing is a speci 'cation, reference being had therein to the accompanying drawings.

The invention relates to dredging or excavating apparatus of that t pe-m which the material 1s carried away t rough a suction pi e.

lllore particularly the invention relates to the construction of a rotary cutter connected at the end of the suction pipe.

In the present state of the art, suction pipes have been provided with rota cutters at the end thereof which sever t e soil into strips 'or sections which may then be carried by the water current'passing' through the suction conduit. With such constructions of cutter, considerable difficulty is experienced in preventing clogging by the lodgmg of masses of clay or soil between the cutter blades or about the rotatin member upon which they are mounted. T us if this member is in the form of a shaft assing centrally through the. suction con uit, it obstructs a valuable ortion' of the passage. 1 On the other hand, the conduit is rotated and the blades attached thereto, the outer ends of said blades are subjected to torsional ,stress. r It is a special object of the present invention to obtain a construction which is free from obstruction to the passage of the soil and yet one which is strongly braced against torsional stresses. v as To this end, the invention consists in the construction as hereinafter set forth. 7 In the drawings, Figure 1 is a longitudinal section through the cutter; and Fig. 2 .is a' sectional end elevation thereof. A is a rotary suction conduit, at the outer end of which is attacheda rotary cutter B. This cutter comprises a flarin sleeve C which is secured to the end of t e conduit A and a series of ion itudinally-extending. 60 blades D attached at t eir inner ends to the flaring sleeve and at their-outer ends bent towards the center and connected to a common head E. Each of the blades D is inclined to the path of rotation so asto sever a strip from the matter in contact with which the cutter is vrotated and direct the same into the suction conduit. The blades are further provided with cross-cutters D atfar described, the (lIlVlYlgjOf the blades is eflected solely through f'rheir attachment with the flaring sleeve Q1 and consequently the outer ends will be subjected to considerable torsional stress, enden ering the life of the cutter. I have there ore provided a brace for connecting the head E with the sleeve (1 but so arran ed as not to forman obstruction in the pat of the material en-. termg 'the suction conduit. This brace is .formed-bv a plurality of inclined arms I connects at one end to the sleeve? near the peri hery thereof and at the opposite end to t e head E near the center. blade is of a cross section that is of greater depth than width and thus the surface flX-' posed in the path of the soil is very small.

urtherinore, the attachment to the sleeve 0 being near the once is rovided ibr the passage of the ma-- o positely tapered recess in the head liiand t e parts are then firmly clamped to eacl; other by a taperln sleeve H and a clamping nut I bearin t ereon and engaging a threaded stud extending outward frem the m G. The inner ends of the maye riveted or otherwise secured. to

' sleeve 0.

In operation, the rotation of the sea-c. and attached sleeve C wiii he d'" tiy cone municated to the head It through the medium. of the brace arms F and in this way torsional. stress '11 on the blades D is avoided. The

eriphery, abundant clean terial, w ereas a construction provided with Hit materia severed into narrow stripshy the 1 combined action of the blades l1 and 013338",

cutters I) will easily ass into the suction conduit throu h the taxing mouth formed,

duit, of a sleeve at the end thereof, a seriesof'longitudinally-extending blades connected to said sleeve and a brace extending from said sleeve to the outer ends of said blades to' relieve the same from torsional stress.

4. The combination with a suction conduit, of a flaring sleeve at the end thereof, a series of longitudinally-extending blades connected to said sleeve and a brace extending from the flaring portion of said sleeve to the outer ends of said blades to relieve the latter from torsional stress.

5. The combination with a sleeve or mouth-piece for a suction conduit, of a series of longitudinally extending cutter blades bent longitudinally inward at their outer ends, a head to which the outer ends of said blades are attached and a brace extending from said head to said sleeve or mouthpiece.

6. The combination with a sleeve or mouth-piece for a suction conduit, of a series of longitudinally extending blades bent radially inward at their outer ends, a head to which the outer ends of said blades are attached and a brace comprisin a plurality of inclined arms extending from the central portion of said head to said rotary sleeve.

7.'A rotary cutter comprising a flaring sleeve constituting the mouth-piece of a suction conduit, a series of longitudinallyextending cutter blades attached to said sleeve and bent radially inward at their.

outer ends, a head to which said blades are attached and a brace comprising a plurality of inclined arms centrally connecting to said head at-their outer ends and attached to the flaring portion of said sleeve at their inner ends.

8. A rotary cutter comprising a flaring sleeve or mouth-piece for a suction conduit, a series of longitudinally-extending blades attached thereto and bent radially inward at their outer ends, a head to which the outer ends of said blades are attached having a tapering central aperture therein, a brace member having an oppositely-tapering pin extending into said aperture and a plurality of inclinedarms extending to the flaring portion of the sleeve, a tapering sleeve fitting between said pin and head, a threaded stud on said pin and a clamping nut engaging said stud for tightening said ll'aring sleeve to clamp said brace to said head.

In testimony whereof I allix my signature in presence of two witnesses.

JOHN B. CANTWELL.

Witnesses:

ULYSSES S. MeCUnY, DreK. W. Drcrr. 

